Milk bottle evacuating cap



Jan. 23, 1934. R. c. DUSTERBERG MILK BOTTLE EVACUATING CAP Filed June l5, 1932 IN V EN TOR. R. c. MM5/@ERG BY yow HIJ ATTORNEYA Patented Jan. 23, 1934 UNITED STATES PATENT OFFICE i Application June 15, 1932.

1 Claim.

The main object of this invention is the provision of a sanitary removable cap for milk bottles whereby the milk may be evacuated from the bottle without pouring, and whereby the bottle, after the cap has been applied, remains closed against contact with the air until the bottle is emptied.

Another object of the invention is the provision of such a device with means for syphoning or pumping the milk from the bottle without having to remove the bottle from the refrigerator.

Still another object of the invention is the pro- Vision of a cap such as above-mentioned with means for sealing the cap on the mouth of a milk bottle to exclude contact of the contents of the bottle with the air.

Another object is the provision of a flange bushing of soft material such as iiexible rubber in conjunction with an air passage in the cap normally covered by said flange, the flange being bent by force of air passing through said passage and returning to its original position to close the passage when the air pressure ceases on the flange, thus acting in the manner of a ap valve.

llfhe above and other objects will become apparent in the description below, in which characters of reference refer to like-named parts in the drawing.

Referring briefly to the drawing, Figure 1 is a longitudinal, cross-sectional, elevational view of the device.

Figure 2 is a plan view of the same.

Figure 3 is a side-elevational view of the device in position on a milk bottle.

Referring in detail to the drawing, the numeral indicates a substantially umbrella-shaped body having an axial bore l1 cylindrical in crosssection, open at the bottom and extending toward the top of the body 10. At its upper end, this bore 11 is tapered as shown at 12 and is provided with a roof 13 at the top. The body 10 is enlarged at its central portion by the raised extension 18 having divergent ridges 19 and 20 extending beyond the periphery of the body 10. It is in this extension 18 where the tapering portion 12 of the bore 11, and the roof, lie. A channel 14 passes through the ridge 19 and communicates with the tapered portion 12 of the bore.

On the under side of the body 10, an annular recess 25 is provided in which the upper rim of the milk bottle is adapted to register. On the inner wall of this recess a square shouldered groove 15 is provided, in which a ring or gasket 16, square in cross-section, sits, this gasket being preferably of rubber. A bushing 17 whose cylindrical portion registers in the bore 11, is provided with a flange 17a which ts against the bottom of the body 10. This bushing is made of soft flexible rubber so that the flange 17a may be yieldable. A curved channel 21 extends from Serial No. 617,367

the outer extremity of the ridge 20, partway through said ridge, and curves downward near the bore 11, then extends parallel with the bore to the underside of the body 10, at which point it has its outlet above the upper edge of the flange 17a, so that this flange normally closes the outlet. At its outer extremity, the ridge l is provided with a knurled or threaded nib 22 so that a rubber bulb 23 may be readily attached, the latter being provided with the usual suction valve 24. A long tube 26 adapted to reach to the bottomA of the bottle, is mounted in the bushing 17, where it is tightly retained. This tube may be of glass, hard rubber, or similar material.

It is obvious that when the device is mounted in on a full milk bottle, pressure upon the bulb 23 will force air through the channel 21, and at the outlet of the latter, the flange 17a will be bent downward by the force of the air. The air then passes on into the bottle and forces milk up the tube 26 into the narrowed portion 12, of the central bore, and out through the channel 14. As soon as the pressure is released on the bulb 23, the flexible flange 17a will snap back into position to close the outlet of the channel 21, thus preventing passage of any of the contents into the channel 21 and also return of any of the milk from the channel 14 back into the bottle.

It is obvious that modifications in form and structure may be made without departing from the spirit of the invention.

I claim:

In a device of the class described, a cap adapted to be mounted on a bottle and having a central axial bore open at the bottom and closed at the top, a cylindrical bushing mounted in said bore, a tube having one end mounted in said bushing and projecting into the interior of the bottle, a iiexible flange integral with said bushing lying in contact with the underside of said cap around said bore, said cap having an air inlet channel terminating on the under side of said cap adjacent said bore, said air inlet channel being normally covered by said flange, said cap having an outlet communicating with the upper end of said bore, and means for forcing air into said air inlet channel to urge said flange away from said air inlet channel to force the contents of the bottle through said tube into said bore and out of said cap outlet.

RUDOLF C. DUSTERBERG. 

